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  4. If the bond length of CO bond in carbon monoxide is 1.128 mathringA, then what is the value of CO bond length in Fe(CO)5?

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Q. If the bond length of $CO$ bond in carbon monoxide is $1.128 \,\mathring{A}, $ then what is the value of $CO$ bond length in $Fe(CO)_5? $

IIT JEEIIT JEE 2006Coordination Compounds

Solution:

In $CO$, bond order $= 3$. In metal carbonyls like $Fe(CO)_5, $ due to $d \pi -p \pi $ back-bonding, bond order of $CO$ decreases slightly therefore, bond length increases slightly